flexible gas piping

7/29/2019 flexible gas piping

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Flexible Gas Piping

DESIGN GUIDEAND

INSTALLATION

INSTRUCTIONMANUAL

888-80-Snake(888-807-6253)

Products of

Metal Fab, Inc.

P.O. Box 1138 Wichita, KS 67201

316-943-2351 Fax: 316-943-2717


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1.0 introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1

User Warnings

Limitations of Manual

DIAMONDBACK Applications

Listing of Applicable Codes and Standards

Code Caution

2.0 dEScriPtion oF SYStEM And coMPonEntS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4

System Description

Hardware Description

Tubing

Fittings

Manifolds, Regulators, and Valves

Striker Plates

Conduit, and Mounting Brackets

3.0 conFigurAtionS And Sizing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11

3.1 SystemCongurations

Series and Parallel Low Pressure Systems

Elevated/Dual Pressure Systems

3.2 Sizing Methods and Examples

Use of Sizing Table

Low Pressure Systems

Elevated/Dual Pressure Systems

Diamondback CSST System with Other Approved Fuel Gas Piping Materials

4.0 inStAllAtion PrActicES . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17

4.1 General installation practices

Minimum Bend Radius

Debris Protection

Support

4.2 Fitting Assembly

Minimum Tightening Torque

Tubing Cutting and End Preparation

Assembly and Re-Assembly Procedure

tABlE oF contEntS


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4.3 Routing

Vertical Runs

Horizontal Runs

Clearance Holes and Notching

Concealed Locations For Fittings

Indoor/Outdoor Issues

4.4 Protection

Striker Plate Requirements

Spiral Metal Hose Requirements

Outdoor Installations

Other Practices.

4.5 Meter Hook-Ups

Special Tubing Termination

Direct Connection

4.6 Appliance Connections

Termination Fittings with Appliance Connectors

Direct Connections

Gas Convenience Outlet

Special Applications

- Roof Top Units

- Outdoor Appliances

- Fireplace Appliances

- Other Appliances

4.7 Manifold Stations

Allowance Locations

Arrangements

4.8 Pressure Regulators

Installation Requirements

Vent Limiter Option

Vent Line and Sizing Requirements

Adjustments

Over Pressure Protection

4.9 Underground Installations

Acceptable Usage

4.10 Electrical Bonding/Grounding


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5.0 inSPEction, rEPAir & rEPlAcEMEnt. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40

Minimum Inspection Requirements

Repair/Replacement of Damaged Tubing

6.0 PrESSurE/lEAKAgE tESting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42

Requirements for Low Pressure Systems

Requirements for Elevated Pressure Systems

7.0 Sizing tABlES . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 44

7.1 DIAMONDBACKTM CSST SIZING TABLES

Table N1 - 7w.c./.5w.c. Drop (13.08 mmHg/.93 mmHg Drop)

Table N2 - 7w.c./1w.c. Drop (13.08 mmHg/1.90 mmHg Drop)



Table N5 - 2psi/1psi Drop (13.79 kPa/6.90 kPa Drop) Table N6 - 2psi/1.5psi Drop (13.79 kPa/10.34 kPa Drop)

Table N7 - 5psi/3.5psi Drop (34.48 kPa/24.13 kPa Drop)

Table P1 - 11w.c./0.5w.c. Drop (20.55 mmHg/.93 mmHg Drop)

Table P2 - 0.5psi/3w.c. Drop (3.45 kPa/5.60 mmHg Drop)

Table P3 - 2psi/1psi Drop (13.79 kPa/6.90 kPa Drop)

Table P4 - 2psi/1.5psi Drop (13.79 kPa/10.34 kPa Drop)

Table P5 - 5psi/3.5psi Drop (34.48 kPa/24.13 kPa Drop)

7.2 BLACK IRON PIPE SIZING TABLE

Table N8 - 7 w.c./0.5 w.c. Drop (13.08 mmHg/.93 mmHg Drop)

8.0 dEFinitionS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 51

Appendix A (Conversion Factors & Terminology)

AppendixB(SpecicGravityFactor)

Appendix C (Installation Checklist)


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1

uSEr wArning! Please read all instructions before starting installation. Improper installationcan result in serious damage, injury and/or death.

The words SHALL or MUST indicate a requirement which is essential to satisfactory and safe produc

performance. The words SHOULD or MAY indicate a recommendation or advice which is not essentiaand not required, but which may be useful or helpful.

DIAMONDBACKexiblegaspiping,byMetal-FabInc.,mustonlybeinstalledbyapersonwhoisqualied

throughtheDIAMONDBACKGasPipingInstallationProgram.Anyinstallermustalsomeetqualications

in accordance with state and/or local requirements as established by the administrative authority which

enforces the plumbing or mechanical code where the gas piping is installed.

Due to the explosive nature of fuel gas, it can be dangerous. It may cause injury to persons or damage to

property.Improperinstallationoffuelgaspipingcouldcauseexplosions,res,ordeath.Soundengineering

practices and principles must be exercised, as well as diligent adherence to the proper installation proceduresfor the safe operation of the piping system.

Precautions must be taken by the installer to ensure that the tubing is not damaged or abused during the

construction process. The tubing ends must be plugged or sealed prior to installation to prevent moisture

dirt or debris from entering. Contact with sharp objects or harmful substances, including, but not limited to

acids and solvents, must be avoided. Sharp bends, stretching, kinks, twisting or undue stress or strain on

thetubingandttingsmustbeavoided.Allinstalledsystemsmustpasscustomaryinstallationinspectionsby

thelocalbuildingofcialhavingauthoritypriortobeingplacedintoservice.Ifthepipingsysteminstallation

requires components in addition to those supplied by Metal-Fab, the installation instructions shall specify the

speciccomponentsrequired.Theinstructionsshallstatethattheonlycomponentsprovidedorspeciedby

Metal-Fab are to be used in the installation.

TheuseofDIAMONDBACKexiblegaspipingwithanyotherexiblegastubingsystemisinappropriate

The guidelines set forth must be used in conjunction with state and local building codes. Local codes wil

take precedence in the event of a conict between this manual and the local code. In the absence o

local codes, installation must be in accordance with the current edition of NATIONAL FUEL GAS CODE

ANSI Z223.1/NFPA 54 (USA), or INSTALLATION CODES CAN/CGA-B149.1 & B149.2 (CANADA).

WARNING: The Installer Must Follow The Installation Instructions Exactly.

This system must be installed with strict adherence to this guide as well as local building codes.

Metal-Fab Inc. shall have no responsibility for any misinterpretation of the information contained in this guide

or any improper installation or repair work or for other deviation from the procedures recommended in this

manual,whetherpursuanttolocalbuildingcodesorengineeringspecicationsorotherwise.

This system and related components must be used only with fuel gases, only where the operating gas

pressure does not exceed 5 psi. The maximum actual operating pressure including transients shall not in any

case exceed 6.5 PSI.

cHAPtEr 1.0: introduction


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2

liMitAtionS oF MAnuAl

This document is intended to aid the user in the design, installation and testing of DIAMONDBACKCorrugated

Stainless Steel Tubing (CSST) that is used to distribute fuel gas in residential housing units and light

commercial applications. It is not possible for this guide to anticipate and cover every possible variation in

housingcongurationsandconstructionstyles,applianceloadsandlocalrestrictions.Therefore,therewillbe

applications which are not covered in this guide. For applications beyond the scope of this guide, contact the

DIAMONDBACKdistributor for the area or Metal-Fabs Application Engineering Department for assistance.

The techniques included within this guide are recommended practice for generic applications. These practicesmustbereviewedforcompliancewithallapplicablelocalfuelgasandbuildingcodes.Whereconictexists

between the recommended practice and local requirements, local requirement must take precedence unless

a variance is obtained from the local authority having jurisdiction. This system and related components must

be used only as fuel gas piping where the operating gas pressure does not exceed 5 psi (34.48 kPa).

diAMondBAcK APPlicAtionS

The use of DIAMONDBACK is not restricted by the style, size, age, type of construction, height, orphysical layout of the building where fuel gas service is to be installed. DIAMONDBACK can be used in

bothresidentialandlightcommercialapplications,aswellasnewconstructionandretrottingapplications.

The requirements of this guide, in regard to system design, installation, inspection and testing, are the same

regardless of building application.

The installer must meet local building codes with respect to ame spread and smoke

density regulations for nonmetallic materials. DIAMONDBACK must not be routed in or

through heating and cooling ductwork.

DIAMONDBACKexiblegaspiping canbeused toprovideoutdoorconnections to appliances

that are attached to, or in close proximity to the building.

DIAMONDBACKexiblegaspipingcanberoutedinmostlocationswheretraditionalgaspiping materialsareinstalled:insidehollowwallcavities,alongorthroughoorjoistsinbasements,ontop

ofthejoistsinattics,onrooftopsoralongsoftsorinchasesoutsideofbuildings.

DIAMONDBACK exible gas piping can be run directly to the shut off valves of most xed

appliances without installing an appliance connector. For moveable appliances such as ranges or

dryers,theuseofanapprovedexibleapplianceconnectorisrequired.DIAMONDBACKcannot

be substituted as a connector for this use when the appliance is free to move for cleaning, etc.

DIAMONDBACK exible gas piping can be used for Natural gas and propane (Liqueed

Petroleum gas) and other fuel gases recognized in ANSI Z223.1/NFPA 54 National Fuel Gas Code.

Forundergroundorconcreteburial,theexiblegaspipingrunmustbeencasedinasleeveofPVC,

polyethylene, or other approved water resistant material.

DIAMONDBACKexiblegaspipingcanbeusedinconjunctionwithblackironpipeineithernew

construction or renovation and replacement piping installations. All DIAMONDBACK

ttingsterminate in standard NPT male pipe ttings to interface with appliances, valves, tees,

unions and couplings.


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3

liSting oF APPlicABlE codES And StAndArdS

REGIONAL/MODEL CODES LISTING CSST AS AN ACCEPTABLE GAS PIPING MATERIAL:

ANSILCICSA6.26Standard

CANADA - CAN B149.1 Natural GAS and B149.2 Propane

NFPA 54/ANSI Z 223.1 National Fuel Gas Code

ICBO - Uniform Mechanical Code

BOCA - National Mechanical Code

CABO-1 and -2 Family Dwelling Code

SBCCI - Standard Gas Code

ICC - International Mechanical Code

IAPMO - Uniform Plumbing Code

IAPMO - File Listing #C-3859

City of Los Angeles Research Report #RR5506

In Canada, the installationofANSI/CSA certied DIAMONDBACK exiblegas tubing fornatural andpropane gas piping systems must be in accordance with the applicable sections of the current CAN/CGA-

B149.1 or .2 installation codes, and the requirements or codes of the local utility or other authority having

jurisdiction.AllgascomponentsusedinconjunctionwiththegastubingmustbecertiedforuseinCanada

DIAMONDBACK has been tested to the ANSI standard for Fuel Gas Piping Systems using Corrugated

StainlessSteelTubing.ANSILC1CSA6.26-1997AddendumANSILC1aCSA6.26a-1999;LC1b-2001

and the CAN/CGA Certication Laboratories Requirements LAB-009. FLEXIBLE GAS TUBING FOR

NATURAL AND PROPANE PIPING SYSTEMS.

codE cAution

This document is intended only to provide the installer with general guidance and assistance when designing

and installing a DIAMONDBACK corrugated stainless steel tubing (CSST) fuel gas system. While everyeffort has been made to prepare this document in accordance with the regional model codes in effect at its

printing, Metal-Fab cannot guarantee that the local administrative authority will accept these regional codes.

It is the ultimate responsibility of the installer to determine suitability of the DIAMONDBACK gas piping

system for use in construction. Metal-Fab assumes no responsibility for labor or materials which have been

installed without prior determination of local code authority acceptance.

USC


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4

SYStEM dEScriPtion

A. The DIAMONDBACK system has a number of hardware and design differences from

conventional gas piping system using black iron pipe. These differences can be described as

follows: The DIAMONDBACK system uses exible annular corrugated tubing made of 300 series

stainless steel.

The tubing is connected using special mechanical ttings designed for Metal-Fabs

DIAMONDBACK.

In many applications, the tubing is sized for individual gas appliance loads and is, therefore,

usually smaller in diameter. The tubing is often piped in parallel from a central distribution

manifold rather than in series, as is common with black iron systems.

The system can be used for elevated pressure systems up to 5 psi (34.48kPa).

Different handling and installation procedures are required during installation.

DIAMONDBACK can be used for both a low pressure (below 0.5 psi (3.45 kPa)) system and anelevated (5.0 psi (34.48kPa)) pressure system design. It complies with the ANSI/CSA LC-1

standard and is approved for fuel gas applications.

B. DIAMONDBACK Corrugated tubing may be installed in combination with other approved

fuel gas piping materials using approved threaded couplings, unions, elbows, tees or

terminations at the interface.

DIAMONDBACK may be used like black iron pipe in low pressure gas piping systems

(12 in w.c. (22.42 mmHg) or less). However, an elevated pressure system will allow the use of

smaller tubing sizes. An elevated pressure system typically operates at 2-5 psi (13.79 - 34.48 kPa)

gas pressure from the meter regulator to an intermediate line regulator/central distribution

manifold. At that point, the pressure is reduced to a lower pressure (7 in w.c. (13.07 mmHg))

Independent tubing runs, operated at low pressure, connect each appliance to the distributionmanifold.

C. Using FIG. 2-1 as a guide, the elevated pressure system can be described as follows:

An elevated pressure DIAMONDBACK system uses a distribution arrangement consisting of a

shut-off valve, pressure regulator and multiport manifold.

Gas is delivered to the housing unit or building at street pressure which is then reduced at the

service regulator.

The entire gas load is piped by a single line through an approved shut off valve, then through an

approved line regulator where the pressure is reduced. At this point it enters a centrally located

distribution manifold where the gas is distributed to each individual appliance (or small group of

appliances) through independent DIAMONDBACK tubing lines.

Thetubingisthenconnectedtoeachapplianceaccordingtolocalcodes(e.g.driplegs,exible

appliance connector, hard piping).

Any extra ports in the manifold are plugged until additional gas appliances are added. It is

advisable to put a valve in the extra ports and then plug the valve outlet. This extra port can then

be used for future expansion without turning off the existing system.

D. The choice of system conguration is dependent on local piping restrictions, structural

arrangement, availability of elevated pressure, and the total gas load.

cHAPtEr 2.0: dEScriPtion oF SYStEM And coMPonEntS


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5

HArdwArE dEScriPtion

This gas piping system using DIAMONDBACKcorrugated stainless steel tubing consists of the following

components:

DIAMONDBACKCorrugated Stainless Steel Tubing (CSST)

Mechanical Joint Fittings

Steel Indoor Termination Fittings

Brass Outdoor Termination Fittings

Mechanical Couplings

Manifolds

Striker Plates

Gas Pressure Regulators (For Dual/Elevated Pressure System)

Shut-Off Valves

Black Iron Pipe, Fittings and Nipples (if selected)

Strip Wound Metal Conduit

Termination Brackets Manifold Brackets

The tubing is jacketed with yellow polyethylene sleeve which provides ease of running through joists, studs

and other building components. The jacket is marked at one foot intervals with the amount of tubing left on

the reel, for quick measurement. The yellow color is the international designation for fuel gas.

The regulator, for reducing pressure from Pounds Per Square Inch (PSI) to inches of water column is used

in elevated pressure system installations over 12 in. w.c. (22.42 mmHg).

Elevated pressure shut off ball valves are used in systems with supply gas pressures ranging from 2 ps

(13.79 kPa) up to 5 psi (34.48kPa). Use only valves which comply with IAS U.S. Requirement 3-88 and/or

CR 91-002. Valves complying with this requirement but not complying with ASME B16.33 and/or CGA 3.11

shall not be installed outdoors.

The Four-Port Manifold allows parallel installations with individual runs or home runs to each appliance.

Protection devices (striker plates and spiral wound conduit) are used where DIAMONDBACK piping

passes through studs, joists and other building materials and is restricted from moving to avoid nails, screws

andotherpuncturethreats.Therearefourstrikerplatecongurationsmadefromspeciallyhardenedstee

toresistpenetrationfromscrewsandpneumaticnailguns.Inaddition,spiralwoundsteeloppyconduitis

available for use in areas where striker plates cannot be used.

Fig. 2-1 Eevae Pesse Sysem Aaeme

SHUT OFF VALVE

PRESSURE REGULATOR REDUCING,

SELF CONTAINED

GAS METER

DISTRIBUTION MANIFOLD

KEY

SERVICE REGULATOR

STREET PRESSURE 2-5 PSIG

APPROVED LINE REGULATOR

2 PSIG TO 8 IN. W.C.

APPLIANCE LINES


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6

O.D. I.D. JACKET O.D.

DIAMONDBACK FLEXIBLE GAS

TUBING

Material: 300 Series Corrugated Stainless

Steel with Polyethylene Jacket.

Part No. 375DFT 500DFT 750 DFT 1000DFT 1250DFT

Size 38 (10) 12 (13) 34 (19) 1 (25) 1 14 (32)

EHD* 15 19 25 31 37

Jacket O.D. (max.) .617 .781 1.050 1.346 1.606

I.D. (nominal) 0.464 0.610 0.844 1.092 1.327

O.D. (nominal) 0.585 0.748 1.023 1.307 1.582

tuBing

DIAMONDBACK ON REELS

Material: 300 Series Corrugated Stainless Steel

with Polyethylene Jacket. Packaged on Plywood

Reels.

Used to convey gas

Part No. 375DFT 500DFT 750 DFT 1000DFT 1250DFT

Size 38 (10) 12 (13) 34 (19) 1 (25) 1 14 (32)

Reel Length250 ft.

(76.20m)

250 ft.

(76.20m)

250 ft.

(76.20m)

150 ft.

(45.72m)

125 ft.

(38.10m)

Weight30 lbs.

(13.61kg)

40 lbs.

(18.14kg)

58 lbs.

(26.31kg)

48 lbs.

(21.77kg)

70 lbs.

(31.75kg)

*EHD(EffectiveHydraulicDiameter):Arelativemeasureofowcapacity


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7

STRAIGHT FLANGE MOUNT TERMINATION

FITTING

Material: CA360 Brass Fitting

Indoor: Black Iron Flange

Outdoor: Brass Flange

Usedforwall/oorterminationfor

appliance connector

SPLIT RING

MALE ADAPTER

FLANGE

TUBING

SEAL NUT WITH FLANG

THREAD

SEAL NUT WITH

FLANGE THREAD

MALE ADAPTER

CA360 Brass Part Nos. 375DBFF 500DBFF 750DBFF 1000DBFF 1250DBFF

Black Iron Part Nos. 375DFF 500DFF 750DFF 1000DFF 1250DFF

Fitting Size 38 (10) 12 (13) 34 (19) 1 (25) 1 14 (32)

Pipe Thread (NPT) 12 12 34 1 1 14

Part No. 375DC 500DC 750DC 1000DC

Fitting Size 38 (10) 12 (13) 34 (19) 1 (25)

MECHANICAL COUPLING

Material: CA360 Brass.

Used to connect two

DIAMONDBACKTM

tubes of the same size.

MALE ADAPTER

SEAL NUT

SPLIT RING

TUBING

MALE ADAPTER

Part No. 375DMF 500DMF 750DMF 1000DMF 1250DMF

Fitting Size 38 (10) 12 (13) 34 (19) 1 (25) 1 14 (32)

Pipe Thread (NPT) 12 12 34 1 1 14

STRAIGHT MECHANICAL JOINT

FITTING


Used to connect DIAMONDBACK

tubing to a manifold or gas outlet.

FittingS

SEAL NUT

COUPLING BODY

SPLIT RING

TUBING

SEAL NUT

SEAL NUT

COUPLING BODY

SEAL NUT


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8

MULTIPORT MANIFOLDS

Materials: Carbon Steel

Used to route DIAMONDBACK tubing to

multiple appliances.

Part No. 500DSM 750DSM

Outlet 4 Port 12 NPT Female 4 Port 1 NPT Female

Inlet 34 NPT Female 114 NPT Female

STUB-OUT FITTING

Material: Black Iron.

Used for the termination of gas line.

Part No. 500DTF 500D90TF 750DTF

Fitting Size 12 (13) 12 (13) 34 (13)

Pipe Thread (NPT) 12 12 34

5 SQ. 5 SQ. 2 34

TEE FITTINGS


Used to connect three

DIAMONDBACKTM

tubes of the various sizes.

Part No. DT555 DT7555 DT75575 DT17575 DT151 DT1751Run 1 Size 12 NPT 34 NPT 34 NPT 1 NPT 1 NPT 1 NPT

Tap Size 12 NPT 12 NPT 12 NPT 34 NPT 12 NPT 34 NPT

Run 2 Size 12 NPT 12 NPT 34 NPT 34 NPT 1 NPT 1 NPT

SEAL NUT

TUBING

SPLIT RING

TEE BODYTEE BODY

RUN 2

TAP

RUN 1


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9

LINE PRESSURE REGULATOR

0.5 psi - 2.0 psi (3.45 kPa - 13.79 kPa) Per ANSI Z21.80

Materials: Cast Aluminum Housing Suitable

For Outdoor Use.

Used to control line pressure.

* Must be vented outdoors.

ELEVATED PRESSURE SHUT-OFF VALVES

Materials: Brass Housing With Stainless Steel Ball.

Used to close supply of fuel to an appliance.

LINE PRESSURE REGULATOR w/ OPD

2.0 psi - 5.0 psi (13.79 kPa - 34.48 kPa) Per ANSI Z21.80Materials: Cast Aluminum Housing Suitable

For Outdoor Use.

Used to control line pressure.

Part No. 500DR3N 500DR3P 750DR5A ~

Model No. 325-3L/Type90 325-3LP 325-5AL/Type95 325-7L*

Port Size 12 x 12 NPT 12 x 12 NPT 34 x 34 NPT 1 14 x 1 14 NPT

Vent Size 18 NPT 18 NPT 38 NPT 12 NPT

Fuel Type Natural Gas Propane Gas Natural Gas Natural Gas

Part No. 500DR3XN 750DR5XA

Model No. 325-3L47 325-5AL48

Port Size 12 x 12 NPT 34 x 34 NPT

Vent Size 18 NPT 38 NPT

Fuel Type Natural Gas Natural Gas

Part No. 500DBV 750DBV

Port Size 12 x 12 NPT 34 x 34 NPT

Tubing Sizes 38 (10) & 12 (13) 34 (19)


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10

LARGE STRIKER PLATE

PartNo.DSPX

Materials: 16 Gauge Hardened Steel

Size: 6 12 x 17 (165 x 432)

Used to protect tubing from puncture at areas of

support.

FULL STRIKER PLATE

Part No. DSPF


Size: 3 12 x 11 12 (89 x 292)


support.

HALF STRIKER PLATE

Part No. DSPH


Size: 3 12 x 6 12 (89 x 165)


support.

QUARTER STRIKER PLATEPart No. DSPQ


Size: 3 12 x 1 12 (89 x 38)


support.

StriKEr PlAtES


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11

FLOPPY STRIP WOUND CONDUIT

Materials: Type RW Galvanized Steel.

Used to protect tubing from puncture in area of

support.

TERMINATION OUTLET BRACKET

Part No. DTMB

Materials: 16 gauge galvanized steel.

Usedformountingallangeadapterttingstostuds

during rough installation.

MANIFOLD MOUNT BRACKET

Part No. DMB

Materials: 16 gauge galvanized steel.

Used for mounting manifolds to studs during rough

installation.

Part No. 375DFC 500DFC 750DFC 1000DFC 1250DFC

Fits Sizes 38 (10) 12 (13) 34 (19) 1 (25) 1 14 (32)

Length50 (15.24m)

Roll

50 (15.24m)

Roll

50 (15.24m)

Roll

25 (7.62m)

Roll

25 (7.62m)

Roll

Part No. 375DFC-1 500DFC-1 750DFC-1 1000DFC-1 1250DFC-1

Fits Sizes 38 (10) 12 (13) 34 (19) 1 (25) 1 14 (32)

Length 1 (3.05m) 1 (3.05m) 1 (3.05m) 1 (3.05m) 1 (3.05m)


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12

cHAPtEr 3.0: SYStEM conFigurAtionS & Sizing

3.1 SYStEM conFigurAtionS

seriesandparallellowpressuresystems

APPLIANCE

SHUTOFF

VALVE

PRESSURE

REGULATORLINE

SHUTOFF

VALVE

GAS

DISTRIBUTION

MANIFOLD

LENGTH OF RUNS

A = 10 FT. (3.05m)

B = 10 FT. (3.05m)

C = 15 FT. (4.57m)

SUPPLY PRESSURE: 7 IN. W.C.

(13.08 mmHg)

ALLOWABLE DROP: 0.5 IN W.C.

(.93 mmHg)

WATER HEATER

35 CFH

FURNACE

65 CFHLOW PRESSURE

GAS METER

100 CFH

C A

B

0.5 PSI

(3.45 kPa)

GAS METER

FURNACE

80 CFH

WATER HEATER

40 CFH

RANGE

55 CFH

DRYER

30 CFH

D

A

E

C

B

LENGTH OF RUNS

A = 10 FT. (3.05m)

B = 20 FT. (6.10m)

C = 10 FT. (3.05m)

D = 40 FT. (12.19m)

E = 10 FT. (3.05m)

SUPPLY PRESSURE: 12 IN. W.C.

(22.42 mmHg)

ALLOWABLE DROP: 6 IN. W.C.

(11.21 mmHg)

FIG. 3-1 Key For Pictorial

FIG. 3-2 EXAMPLE 1 - Low Pressure System, 7 in. w.c. (13.08mmHg), Series Arrangement

FIG. 3-3 EXAMPLE 2 - Low Pressure System, 12 in. w.c. (22.42 mmHg) Parallel Arrangement


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13

duAl PrESSurE SYStEMS

3.2 Sizing MEtHodS And ExAMPlES

Thischapter includesexiblegaspipingsizingproceduresforboth lowpressureandelevatedpressure

systems.Everypipingsystemintroducespressurelosstothefuelgasowingwithin.Theamountofloss

dependsonthepipingsizeandtheow,expressedincubicfeetperhour(CFH),andconvertedtoBTUs

The objective of the sizing exercise is to determine the allowed pressure loss or drop within the length of

piping required.

uSE oF Sizing tABlES

Chapter 7 of this manual consists of fuel gas pipe sizing tables. These tables are required to determine the

minimum size fuel gas pipe for each part of a fuel gas system. To use these tables you will need to know the

supply gas pressure, the CFH requirement on the section of the system and the length, in feet, of the piping

run.

The tables are listed by the supply gas pressure and the allowable gas pressure drop. For example, the low

pressure system call out a 7 in. w.c. (13.08 mmHg) supply pressure with a 0.5 in. w.c. (.93 mmHg) pressure

drop.

Findthecorrecttable.Onthetable,ndthecolumnwiththelengthinfeetofthegaspiperunyouare

looking for. (If the length you are looking for is not on the list go to the next longer length.) Check the CFHratingsofthefuelgaspipeuntilyoundwhichonewillhandletheCFHrequirementatthedeterminedlength

Match that CFH rating to the corresponding size of pipe.

Chapter 3.2 of this manual gives examples of this procedure.

Longest Run Method (Low/Medium Pressure Systems)-FIG. 3-2 and 3-3

The low pressure series system (conventional arrangement) is sized in the same way as a conventional low

pressure black iron pipe system using the sizing tables. This method is known as the longest run method

Pressure drop in a low pressure system is usually limited to 0.5 in. w.c. (.93 mmHg) over the system. Medium

pressure systems can have pressure drops of up to 6 in. w.c. (11.21 mmHg).

2 PSI

(13.79 kPa)

GAS METER

FURNACE

80 CFH

WATER HEATER

40 CFH

RANGE

55 CFH

DRYER

30 CFH

D

A

E

C

B

LENGTH OF RUNS

A = 100 FT. (30.48m)

B = 15 FT. (4.57m)

C = 10 FT. (3.05m)

D = 25 FT. (7.62m)

E = 20 FT. (6.10m)

ELEVATED SUPPLY PRESSURE: 2 PSI (13.79 kPa)

ALLOWABLE DROP UP TO REGULATOR: 1 PSI

(6.90 kPa)

LOW PRESSURE SUPPLY: 10 IN W.C. (18.68 mmHg)ALLOWABLE DROP REGULATOR TO APPL.: 3 IN. W.C.

(5.60 mmHg)

FIG. 3-4 EXAMPLE 3 - Elevated/Dual Pressure System, 2PSI (13.79 kPa), Parallel Arrangement


18/60

14

Elevated/Dual Pressure Systems - FIG. 3-4

Elevated pressure systems incorporate two operating pressures downstream of the gas utility meter set. The

rstpressure,setbytheserviceregulatoratthemeter,isusually2psi(13.79kPa).Thispartofthesystemis

sized separately and ends at the pounds-to-inches line regulator. The allowable pressure loss for this part of

the system must be added to the effect of the regulator to determine the available pressure at the regulator

outlet. Table 3-5 below shows pressure losses for maximum loads through the regulator.

For a 2 psi (13.79 kPa) system, the proper drop is usually 1 psi (6.90 kPa) for this part of the system. This

allows for the approximate 0.75 psi (5.17 kPa) regulator drop downstream and provides the 0.25 psi (1.72

kPa) (6-7 in. w.c. (11.21 - 13.08 mmHg)) necessary for appliances. The regulator reduces the pressure frompounds per square inch to inches water column (in. w.c.). This part of the system is sized the same as a low

pressure system, except that a special Table N-3 is used allowing 3 in. w.c. (5.60 mmHg) drop. These lines

are typically sized for only one appliance load installed as a home-run from the manifold.

NOTE: At 250 CFH gas ow the Maxitrol 325-3L or O.A.R.A. Type 90 regulator contributes 0.75 psi (5.17

kPa) drop to the system (See Table 3-5). The low pressure part of the system downstream of the regulator

requires the standard 0.25 psi (1.72 kPa) to power appliances. Deducting the 0.75 psi (5.17 kPa) drop for

the regulator and the 0.25 psi (1.72 kPa) load for the appliances, the maximum allowable drop for the gas

meter run is 1 psi (6.90 kPa).

For example, start with 2 psi (13.79 kPa), 0.75 psi (5.17 kPa) drop for regulator and 0.25 psi (1.72 kPa) to

run the appliances, this results in 1 psi (6.90 kPa) drop forSection A.

Sizing ExAMPlES

To size each of the following systems, determine the required size for each section and outlet. To size

each section of the system, determine both the local gas load for all appliances and the maximum distance

(longest run) in which a particular section delivers gas.

Example 1 Low Pressure System, 7 in. w.c. (13.08 mmHg) Series Arrangement

1. The system presented in FIG. 3-2 is typical of a single family installation in which there are a limited

number of appliances located in one general area. The supply pressure is 7 in. w.c. (13.08 mmHg) and the

allowable drop is 0.5 in. w.c. (.93 mmHg).

2. To size Section A, determine the longest run (the longest run is the length from the meter to the

furthest appliance) and total gas load for each appliance in cubic feet per hour (CFH), 1 CFH =

1,000 BTU: Meter to Furnace = A + B = 10 + 10 = 20 ft. (3.05m + 3.05m = 6.10m)

Meter to Water Heater = A + C = 10 + 15 = 25 ft. (3.05m + 4.57m = 7.62m)

This is the longest run.

Total load = Furnace + Water Heater = 65 + 35 = 100 CFH (100,000 BTU)

Select Table N-1 (Page 44) 7 in. w.c. with 0.5 in. w.c. drop (13.08 mmHg with .93 mmHg

Drop). Using the longest run method, select the column showing the measured length, or the

next longest length if the table does not give the exact length. Referring to Table N-1, the column

for 25 ft. (7.62m) of piping shows that sizes 3/8 (10) and 1/2 (13) are too small and the next

available size is 3/4 (19) with a maximum capacity of 158 CFH. The correct size is 3/4 (19).

Table 3-5Capacities and Pressure Drop Through Maxitrol/O.A.R.A Regulator

Model 7 in. w.c.

(13.08 mmHg)

0.5 psi

(3.45 kPa)

0.75 psi

(5.17 kPa)

1 psi

(6.90 kPa)

Maxitrol 325-3L 145 CFH 204 CFH 250 CFH 289 CFH

Maxitrol 325-5AL 338 CFH 476 CFH 583 CFH 673 CFH


O.A.R.A Type 90 155 CFH 220 CFH 280 CFH 310 CFH

O.A.R.A Type 95 359 CFH 504 CFH 627 CFH 719 CFH


19/60

15

3. To size Section B, determine the length of run from the Meter to the Furnace and the load delivered:

Length = A + B = 10 + 10 = 20 ft. (3.05m + 3.05m = 6.10m), Load = 65 CFH (65,000 BTU)

Table N-1 shows that size 1/2 (13) supplies 77 CFH.

The correct size is 1/2 (13).

4. To size Section C, determine the length of run from the Meter to the Water Heater and the load delivered:

Length = A + C = 10 + 15 = 25 ft, (3.05m + 4.57m = 7.62m). Load = 35 CFH (35,000 BTU)

Table N-1 shows that size 12 (13) is required, because size 38 (10) has a maximum capacity of 33CFH.

The correct size is 12 (10).

Example 2 Low Pressure System, 12 in. w.c. (22.42 mmHg) Parallel Arrangement.

1. The system shown in FIG. 3-3 is typical of a single family installation with several appliances and medium

loads. The appliances are installed apart instead of all together, and the arrangement chosen is parallel. The

higher supply pressure of 12 in. w.c. (22.42 mmHg) allows a higher pressure drop, 6 in. w.c. (11.21 mmHg

than is available with low pressure systems.

2. To size Section A, determine the longest run from the Meter to the furthest appliance and the total load:

Meter to Range = A + B = 10 + 20 = 30 ft. (3.05m + 6.10m = 9.15m)

Meter to Water Heater = A + C = 10 + 10 = 20 ft. (3.05m + 3.05m = 6.10m)

Meter to Furnace = A + E = 10 + 10 = 20 ft. (3.05m + 3.05m = 6.10m)

Meter to Dryer = A + D = 10 + 40 = 50 ft. (3.05m + 12.19m = 15.24m) This is the longest run.

Load = Dryer + Range + Water Heater + Furnace = 30 + 55 + 40 + 80 = 205 CFH (205,000 BTU)

Select Table N-4 (Page 45) Low Pressure 12 in. w.c. (22.42 mmHg) with 6 in. w.c. (11.21 mmHgdrop). It shows that 12 (13) size is too small for 205 CFH at 50 ft (15.24m)., but size 34 (19) can

handle 365 CFH.


3. To size Section B, determine the length of run from the Meter to the Range and the load delivered:

Length = A + B = 10 + 20 = 30 ft. (3.05m + 6.10m = 9.15m), Load = 55 CFH (55,000 BTU)

Table N-4 shows that size 38 (10) can handle 106 CFH at 30 feet (9.15m).


4. To size Section C, determine the length of run from the Meter to the Water Heater and the load delivered:

Length = A + C = 10 + 10 = 20 ft. (3.05m + 3.05m = 6.10m), Load = 40 CFH (40,000 BTU)



5. To size Section D, determine the length of run from the Meter to the Dryer and the load delivered:

Length = A + D = 10 + 40 = 50 ft. (3.05m + 12.19m = 15.1m), Load = 30 CFH (30,000 BTU)



6. To size Section E, determine the length of run from the Meter to the Furnace and the load delivered:

Length = A + E = 10 + 10 = 20 ft. (3.05m + 3.05m = 6.10m), Load = 80 CFH (80,000 BTU)



Example 3 Elevated Pressure System, 2 psi (13.79 kPa), Parallel Arrangement

1. The system shown in FIG. 3-4 is adapted for multifamily or single family application with an extended

100 ft. (30.48m), tubing run from the meter to the regulator. The 2 psi system is well adapted to handle the

long runs required in multifamily buildings with centralized meter banks.

2. To size Section A, determine the total gas load it will deliver:

Load = Furnace + Water Heater + Dryer + Range = 80 + 40 + 30 + 55 = 205 CFH (205,000 BTU)

Select Table N-5 (Page 46) Elevated Pressure 2 psi (13.79 kPa) with 1 psi (6.90 kPa) drop. This is the

standard table chosen to stay within the Maxitrol 325-3L or O.A.R.A Type 90 regulator capacity.

Length = 100 ft. (30.48m)

Table N-5 shows that 38 (10) size is too small for 205 CFH, but 12 (13) can handle 249 CFH. The correct size is 12 (13).


20/60

16

3. To size each of the other sections, select Table N-3 (Page 45) Regulator Outlet 10 in. w.c. (18.68 mmHg)

with a drop of 3 in. w.c. (5.60 mmHg):

Section B is 15 ft. (4.57m) with a 40 CFH load. The suitable size 38 (10) has 106 CFH capacity

at 15 ft. (4.57m)

Section C is 10 ft. (3.05m) with a 80 CFH load. The suitable size 38 (10) has 131 CFHcapacity

at 10 ft. (3.05m).

Section D is 25 ft. (7.62m) with a 30 CFH load. The suitable size 38 (10) has 82 CFH capacity

at 25 ft. (7.62m)

Section E is 20 ft. (6.10m) with a 55 CFH load. The suitable size 38 (10) has 92 CFH capacity

at 20 ft. (6.10m)

The correct size for all the above runs is 38 (10).

ExAMPlE 4 - coMBinAtion diAMondBAcK cSSt SYStEM in conJunction witH otHEr APProVEd

FuEl gAS PiPing MAtEriAlS

FIG. 3-6 BLACK IRON PIPE AND CSST SYSTEMS

METER

FURNACE

75 CFH

WATER HEATER

30 CFH

FIREPLACE

30CFH

D

A

E

C

B

LENGTH OF RUNS

A = 40 FT. (12.19m)

B = 50 FT. (15.24m)

C = 30 FT. (9.14m)

D = 20 FT. (6.10m)

E = 20 FT. (6.10m)

SUPPLY PRESSURE: 7 IN. W.C. (13.08mmHg)

ALLOWABLE DROP: 0.5 IN. W.C. (.93 mmHg)

CSST

BLACK IRON PIPE

Example 4 - Combination Black Iron Pipe and Diamondback CSST System

1. When adding Diamondback to an existing black iron pipe system use the longest length method

explained earlier in this chapter. In FIG. 3-6 the home has an existing supply line of one-inch black iron

pipe. The supply pressure is 7 in. w.c. (13.08 mmHg) with an allowable drop of 0.5 in. w.c. (.93 mmHg).

2. To size Section A. Determine the total load of the home (170 CFH) and the longest run, 90 ft. (27.43m).

Table N-8 (Page 50) shows that 1 (25) dia. pipe has a capacity of 205 CFH at 90 ft. (27.43m) The 1 (25)

dia. pipe (Section A) will handle the load.

3. To size Section B.Determinetheloadofthereplace(30CFH)andthelengthoftherun,90ft.(27.43m)

Table N-1 (Page 44) shows the suitable size Diamondback is 12 (13).

4. To size Section C. Determine the load of the quick connect (35 CFH) and the length of the run., 70 ft.

(21.34m) Table N-1 shows the suitable size Diamondback is 12 (13).

NOTE: If the supply pressure was raised by the gas utility to 10 in. w.c. (18.68 mmHg) with allowable

pressure drop of 3 in. w.c. (5.60 mmHg), Table N-3 (Page 45) shows Sections B & C could both be run

with 38 (10) Diamondback CSST.


21/60

17

cHAPtEr 4.0: inStAllAtion PrActicES

4.1 gEnErAl inStAllAtion PrActicES

codE coMPliAncE

dESign liMitAtion

DIAMONDBACK fuel gas systems shall not operate at pressures exceeding 5 psi (34.48 kPa). Thedesign operating pressures for the elevated pressure systems are 2-5 psi (13.79-34.48 kPa) from the mete

to the pressure regulator, and 12 in. w.c. (22.42 mmHg) or less, from the pressure regulator to the inlet of

the appliance regulator. The pressure regulator must be approved for operation for at least 5 psi (34.48 kPa)

inlet pressure. On low pressure systems, less than 0.5 psi (3.45 kPa), where a pressure regulator is not

necessary, the design operating pressure may be set by the local utility between 7 and 12 in. w.c. (13.08 and

22.42 mmHg).

PlAnning SYStEM dESign

1. ConrmthatthelocalbuildingcodeauthorityhasacceptedtheuseofDIAMONDBACKCSST.

2. Check with the local gas utility or supplier to determine the metered gas supply pressure.

3. Prepare a dimensioned sketch of the installation showing the location of each appliance and

possible piping routes.

4. Determine the load demand for each appliance. This data is commonly found on the manufacturers

nameplate on each gas appliance or is provided by the builder/contractor. Determine the type of

pipinglayoutandDIAMONDBACKsizewhichbesttstheinstallation.

Natural Gas Supply pressure in the USA and Canada is typically 6 to 7 in. w.c. (0.25 psi, 4 oz.

or 1.72 kPa). Higher supply pressures 0.5 psi (14 in. w.c./3.45 kPa), 1 psi (28 in. w.c./6.90 kPa), and

2 psi (56 in. w.c./13.79 kPa) will allow reduced tubing size in the CSST design plane. CSST can

also be used in 5 psi (34.48 kPa) supply pressure systems which are normally restricted to

commercial installations.

Propane Gas (LPG - Liquid Petroleum Gas) Typical propane supply pressure for residentia

buildings is 11 in. w.c. (20.55 mmHg) set at theregulator outside the building. Higher supply pressureswill allow reduced tubing size. Check with your propane supplier and local building code authority.

Determine the total capacity for all appliances planned in the installation. The BTU equivalents for

naturalgasorpropaneow(CFH)canbeobtainedfromthelocalgasutilityorpropanesupplier.Fo

natural gas, one cubic foot per hour (1 CFH) is approximately 1,000 BTU per hour. For propane,

one cubic foot per hour is approximately 2,500 BTU per hour. Check with the local utility for actua

BTU content of the gas. The sizing tables in chapter 7 of this manual can be used for correctly

sizing DiamondbackCSST.

toolS For inStAllAtion

Table 4-1

General Tool ListTool Name Application

Open End Wrench Forassemblyofttings

Adjustable Wrench For gas outlet devices and manifold attachments

Pipe Wrench Forattachmentsoftubingtottingsandmanifoldbody

Screw Driver Formountingofterminationttingsandstrikerplates

Hammer For fastening supports, striker and termination plates

Drill For boring holes through wood or metal framing.

Tubing Cutter To Cut CSST to Proper Length

Utility Knife To Cut CSST Jacket to Proper Length


22/60

18

PrEcAutionS

Precautionsmustbetakentoensurethatanyexposedexiblepipingisnotdamagedorabusedduring

building construction. All system hardware should be stored in a secure, dry location prior to installation.

1. OnlycomponentsprovidedbyMetal-FaborspeciedaspartoftheDIAMONDBACKpipingsystem

are to be used in the installation (black iron pipe is approved).

DO NOT use DIAMONDBACK tubing or ttings with tubing or ttings of any other CSST

manufacturerwhen installing a newsystem. IntermixingofCSST tubingand tting componentsbetween CSST manufacturers is prohibited in a new installation.

2. Ends of the tubing are to be temporarily capped, plugged, or taped closed prior to installation and

pulling through structure to prevent entrance of dirt, or other debris.

3. Contact with sharp objects or harmful substances such as uxesusedforsolderingcoppertubesand

acid based cleaners such as muriatic acid used for cleaning brickwork is to be avoided. Contact with

any chemicals containing chlorides must be followed by thorough rinse and wipe dry.

4. Unduestressorstrainonthetubingorttingsistobeavoided.

Bending exiblegaspiping isone featurewhich contributes tothespeed ofinstallation.The

recommended bend radius for general routing is 3 (76), multiple tight bends can restrict the gas

owandincreasepressuredrop.Caremustbetakentoavoidsharpbends,stretching,kinkingor twisting of tubing. The tightest bend allowed for each size of DIAMONDBACK is shown in

Table 4-2. Typical locations requiring tight bends are termination mount installations in hollow

stud walls.

Table 4-2

Bending Radii

Part No.Tubing

Size

Absolute

Minimum

Bend Radius

Recommended

Installed Bend

Radius

375DFT 38 (10) 1316 (21) 3 (76)

500DFT 12 (13) 1 (25) 3 (76)

750DFT 34 (19) 1 316 (30) 3 (76)

1000DFT 1 (25) 1 1316 (46) 5 (76)

1250DFT 1 14 (32) 2 38 (60) 6 (76)

R

TUBING ALONE

MINIMUM BEND RADIUS


23/60

19

HorizontAl runS And SuPPorting

AllhorizontalrunsshallbesupportedasspeciedinTable 4-3 below.

Tubing that runs parallel to the joists should be supported to the center of the vertical face at least

3(76)fromtheoororceiling.(FIG. 4-14 on Page 25)

Tubing that runs perpendicular to the joists should be supported, preferably routed through drilled

holesinthejoistsorinsideanI-beamange.( FIG. 4-16 on Page 25)

It is acceptable for CSST to lie directly on ceilings capable of supporting the CSST such as

dropped ceilings and sheetrock.

VErticAl runS And SuPPort

The spacing between supports on vertical runs shall not exceed 10 ft. (3.05m)

Unconcealed The tubing shall be supported in a workman like manner with piping straps

tubing clips, bands, brackets or hangers suitable for the size and weight of the tubing. Standard

support materials such as metal, plastic and wood are acceptable.

Concealed It is recommended that concealed vertical tubing be as unconstrained as

possible to avoid future puncture threats such as nails and screws.

4.2 Fitting ASSEMBlY

MAKing Fitting connEctionS to FlExiBlE gAS PiPing

1. Cut tubing to length:

Determine the proper length of the tubing and leave some extra in case it needs to be trimmed

in the future. Use a standard tubing cutter equipped with a sharp (preferably hardened steel)

cutting wheel. Whenever possible, cut a straight section of tubing that hasnt been bent too much.

Remember that the DIAMONDBACK is much thinner and much harder than copper tubing.

Cut through the polyethylene tubing jacket. The cut must be centered in a convolution (valley)

between two corrugations. Use full, circular cutting strokes continuing in the same directions asstarting in. When the wheel has cut through the jacket and is in contact with the stainless steel it

is important to slightly tighten the cutting wheel after a revolution or two for an even cut around

thecircumference.Thetubingmayattenoutifthecutteristightenedtoofast.

Taking a little time doing this procedure correctly can save time during later procedures.

When the majority of the tubing has been severed the tubing cutter will not make anothe

revolution correctly and a small portion of the DIAMONDBACK will remain attached. Remove

the tubing cutter, gently open and close the tubing where the cut was made. Within seconds the

remaining CSST still attached will sever. If the cut is too deformed it can easily be trimmed back

an inch or so following the directions above.

Table 4-3

Horizontal or Inclined Runs Support Spacing

Part No. Pipe Size Spacing of Supports

375DFT 38 (10) 4 ft. (1.22m)

500DFT 12 (13) 6 ft. (1.83m)

750DFT 34 (19) 8 ft. (2.44m) USA, 6 ft. (1.83m) Canada




24/60

20

2. Strip Jacket:

Using a utility knife, strip the jacket back to the middle of the third convolution (valley) from the end

of the tubing. The utility knife and the cut tubing ends are very sharp, Use caution when cutting

the jacket and handling the tubing.

3. Install Split Rings:

Slide the seal nut over the end of the tubing, female side facing toward the tubing end. Place thesplitringsintherstconvolution(valley)attheendofthetubing.Ifthetubingroundnessdoesnt

match the round of the split rings, gently squeeze the split rings together with pliers, this will round

outthetubing.Thesplitringsmayhaveagapbetweenthem;thisisacceptablesincetheydonot

form part of the seal. Pull the seal nut towards the end of the tubing and capture the split rings in

the convolution. If the nut doesnt pass over the tubing, gently squeeze the split rings with pliers

toroundoutthetubingorturnthesplitringsoverforacleaneredge.Ifthettingisreattached

more than three times or the nut can not be pulled over the split rings then the split rings must be

replaced.Packetsofsplitringsareavailableandtheremainingttingpartscanbereused.

4. Wrench Fitting

Place the male adapter into the seal nut and engage the threads. (Notice that the Diamondbackttingsaredesignedtoformaleakproofsealonthestainlesssteeltubingasthettingandseal

nut are tightened.)Using theappropriate wrenches, tighten the ttinguntil themale adapter

bottomsoutandtheresistancetotighteninggreatlyincreases.Thearehasnowbeencreated

onthetubingend.(Removingthemaleadapterwillallowavisualconrmation.)

NOTE:Ifthettingistobeconnectedtopipethread,threadthepipejointrst.Thentorquethe

ttingtothetubingbytighteningthenut.

ALSO: Whenatting isconnected toa termination outlet.First, slide the termination ange

ontothetubing.Second,installandtorquetheterminationtting.Third,threadthetermination

angeontotheterminationsealnut.Fourth,securelyfastentheterminationangetothedesired

position.Alwayssecuretheterminationsealnuttotheterminationangetightlytoavoidfuture

twisting of the CSST.

5. Final Torque

Tightensealnutandtting to the torquevaluesinTable 4-4 below. The actual seal is metal

to metal (brass &stainless steel). If the tting cannotbemade to seal applying torqueper

Table 4-4 below, Do Not Continue To Tighten The Assembly. Disassemble the assembly and

inspectthesealingsurfaces.Cleanbothsealingsurfacesandreassemblethetting.Ifnecessary,

thetubingcanbetrimmedandthettingreattached.

Table 4-4

Tube Part No. Pipe Size Fitting Part No. Required Torque375DFT 38 (10) 375DMF 45 ft-lb.

500DFT 12 (13) 500DMF 50 ft-lb.

750DFT 34 (19) 750DMF 60 ft-lb.

1000DFT 1 (25) 1000DMF 70 ft-lb.

1250DFT 114 (32) 1250DMFPre-Assemble: 60 ft-lb.

Final: 80 ft-lb.


25/60

21

4.3 routing

run locAtion

Runs can be located several places within the building. Depending on local building codes, DIAMONDBACK

tubing can be routed:

Beneath, through, and along side oor joists Consideration should be given to future

constructionpossibilities.InunnishedbasementsitispreferredtorouteCSSTthroughratherthan

below or beneath joists for the protection of the DIAMONDBACK. On top of ceiling joists in attic spaces Considered choice location in areas where slab-on-grade

construction is prevalent.

Inside wall cavities Preferred for vertical sections of piping rather than horizontal sections.

Through conduit embedded in concrete oors and walls When runs must be buried or embedded

in concrete DIAMONDBACKTM shall be routed within a non-metallic, watertight conduit which has an

inside diameter at least 12 (13) larger than the outside diameter of tubing. No DIAMONDBACK

joints are permitted within the conduit.

To gas replaces DIAMONDBACK can be used to deliver gas directly to the valve of a gas

replace.This isapproved indecorativeandheatgeneratinggasreplacesaswellasin allfue

replacesutilizinggaslogsonly.Theyellowpolyethylenetubingjacketandrubbero-ring(ifsupplied)mustberemovedwhenDIAMONDBACKCSSTisroutedinsideofagasreplacerebox.

DIAMONDBACKTM CSST must NOT be routed inside the rebox of a replace that can be used

for burning solid fuel (i.e. wood or coal).

Installation clearance holes for routing the piping through studs, joists, plates, etc. shall have a

diameter12 (13) larger than the outside diameter of the piping. When a structural member must be

drilled, conformance to building codes must be followed (See Table 4-5).

BrAncHing

Avoidbranchingifpossible.Thisminimizesthenumberofjointsinthesystem.Instead,install individual runs to each appliance outlet.

Whenbranchingisnecessary,useastandardNPTClass150malleableirontee,theoutletsof

whichcanbeconnectedtosuitablesizesofDIAMONDBACKttings.

Table 4-5

Installation Clearance Holes

Tubing Size Drill Hole Size

38 (10) 1 18 (29)

12 (13) 1 38 (35)

34 (19) 1 58 (41)

1 (25) 1 78 (48)

114 (32) 2 18 (54)


26/60

22

BorEd HolES

In locations where DIAMONDBACK is installed through bored holes in joists, rafters, or wood

members, holes shall be bored so that the edge of the hole is not less than 2 (51) from the

nearest edge of the wood member. Where this distance cannot be maintained at any point,

the tubing shall be protected by a DIAMONDBACK striker plate of the appropriate length

and width installed in accordance with the striker plate instructions in this manual. The

diameter of the bored holes shall be a minimum of 12 (13) larger than the outside diameter

ofthetubingjacketunlesstheholesizeisinconictwithlocalbuildingcodeswhichshallprevail. The size of the hole drilled through top plates, top frame members, and sole plates, to allow

the vertical passage of the tubing, shall not exceed 12 of the width of the member. The hole should

be bored through the center of the member (See FIG. 4-6 below).

Where sole plates are cut for tubing, the width of the cut shall be 12 (13) larger than the

outside diameter of the tubing jacket but not greater than 2 18 (54), and the tubing must be protected

with a DIAMONDBACKTM striker plate of the appropriate length and width installed in accordance

with this manual (See FIG. 4-6).

Where a hole is to be bored in a joist, the hole should be located at the centerline, otherwise no

closer than 2 (51 mm) from the nearest edge of the joist, and the hole diameter shall not exceed13 the depth of the joist (See FIG. 4-7 below).

Where holes are to be bored in non-bearing vertical members of the wall framing, the size of such

holes shall not be larger than 60 percent of the width of the member (See FIG. 4-8).

Where holes are to be bored in load bearing vertical members of the wall framing, the size of such

holes shall not be larger than 40 percent of the width of the member. Holes up to 60 percent

of the members width are permitted if the members are doubled. No more than two

successive double bored members are permitted (See FIG. 4-9 Page 22).

D

D/3MAX.TYP.

2 (51) MIN.

D/2

2 (51)MIN.

PREFERRED LOCATION

2X4 W/2

W

TOP PLATE

SOLE PLATE

2 18(54)MAX.

CUT WIDTH

STUD

2X4

W/2MAX.TUBING HOLE

FIG. 4-6 Holes and Cuts in Top and Sole Plates FIG. 4-7 Holes in Wood Joists


27/60

23

1 12 (38)

3 12 (89)

58(16)

MIN.

2 18 16 MIN.

HOLES UP TO 60%

OF STUD WIDTH

NON-BEARING WALL

(I.E. 3.5 x 0.6 = 2.1)

(I.E. 89mm x 0.6 = 53mm)

2 x 4 1 12 (38)

3 12 (89

HOLES UP TO 40%

OF STUD WIDTH

BEARING WALL

(I.E. 3.5 x 0.4 = 1.4)

(I.E. 89mm x 0.4 = 36mm)

2 x 4

58 (16)

MIN.

1 38 (35)

MIN.

diAMondBAcK tHrougH MEtAl FrAMing - The installation instructions for metal framed

structures are the same as wood framed structures with the following exception.

When DIAMONDBACK CSST passes through metal members it shall be protected by one of the

following methods:

1. Bushings securely fastened in the opening of the metal member.

2. Grommets securely fastened in the opening of the metal member.

3. A minimum of four wraps of #10 mil. duct tape.

The installer shall insure that no physical contact occurs between the metal member and the

DIAMONDBACK tubing.

guidElinES For inStAllAtion oF concEAlEd cSSt Fitting

General Provisions

It is not the intent of these guidelines to encourage the use of concealed tubing joints. Concealed

jointsshouldbeavoided,andonlyusedwhentheinstallationofahiddenttingistheonlyreasonable solutiontoadifcultsituation.Likeblackironpipesystems,anyjointcanbeapotentialleaksite,and

system designers and installers should strive to minimize the total number of joints in any piping system

regardless of their location.

These guidelines address known installation situations which typically require the use of a concealed

tting.Theseguidelinesdonotsupersedelocalbuildingorplumbingcodes,butratherofferalternativeinstallation practices for consideration by the local authority having jurisdiction.

Denitions

TheNationalFuelGasCode2002(NFPA54)denesconcealedgaspipingasGaspipingthat,whenin placeinanishedbuilding,wouldrequireremovalofpermanentconstructiontogainaccesstothepiping.

FIG. 4-8 Holes In Non-load Bearing Walls FIG. 4-9 Holes In Load Bearing Walls


28/60

24

Subsection 3.4.6 stipulates a similar exception forReconnections.

The American National Standard For Fuel Gas Piping Systems Using Corrugated Stainless Steel Tubing

(CSST) ANSI/CSA LC-1 states under subsection 1.1.4 the following:

Thisstandardincludescriteriatoestablishthesuitabilityofconcealedmechanicaltubettingsforuse

with concealed gas piping.

Exclusions

Theterminationttingisnotaconcealedjoint,andtherefore,isnotaffectedbytheseguidelines.The

terminationttingshallbeinstalledaccordingtotheinstructionsinthismanual.

Manifold stations, which include the multiport manifold and pressure regulator, shall not be installedinaconcealedlocationregardlessofthequalicationsofthetubingttings.

Fittings installed inside accessible enclosure boxes, for such items as quick connect gas outlets or

replaceshut-offvalves,areexemptedfromtheseguidelines.

ExAMPlES oF concEAlEd FittingS in nEw inStAllAtionS

Fireplace Logs

Theconnectiontoavalvecontrollinggasowtoa replaceappliancecanbehiddenwheninstalledasshown in FIG. 4-10.Theconcealedtubingttingcanbeinstalledbeneaththeoor,orhearth,orinsidethe

brickworkofthereplace.Automaticorremotecontrolvalvesinstalledinsideahollowwallcavityadjacent

tothereplaceshallrequiretheuseofanaccessibleenclosurebox.

Multiple Gas Outlets

When multiple gas outlets are supplied from a single run of CSST, each downstream outlet branch can

beconnectedtothemainrunusingatee-typettingwhichcanbelocatedinaconcealedlocationas

shown in FIG. 4-11.

VALVE KEY

BLUE FLAME

GAS VALVE

SUB-FLOOR

CSST

BLACK IRON PIPE

STRIKER

PLATE

SILL PLATE ON

FLOORING

FINISHED CEILING

IN BASEMENT TEE

CSST

FIG. 4-10 Fireplace Valve Installation FIG. 4-11 Multiple Outlets Along Main Tubing Run

NFPA 54 goes on in subsection 3.4.2, Connection in Original Installations,todenethelimitationsand

exceptionsontheuseofconcealedttings:

When installinggaspiping that is tobe concealed,unions, tubing ttings, running threads, right

and left couplings, bushings, swing joints, and compression couplings made by combinations of

ttingsshallnotbeused.

Exception No. 1: Jointing tubing by brazing shall be permitted.

Exception No. 2: Fittings listed for use in concealed spaces that have been demonstrated to sustain,without leakage, any forces due to temperature expansion or contraction, vibration or fatigue based

on their geographical location, or operation shall be permitted to be used.


29/60

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ExAMPlES oF concEAlEd FittingS in ModiFicAtionS to ExiSting inStAllAtionS.

NewCeilingsinUnnishedRooms/Basements

DIAMONDBACK ttings originally installed in accessible ceiling locations can be concealed

at a later date in the event that a ceiling is installed. Precautions shall be taken to ensure

that the newly concealed ttings and tubing are adequately protected from accidental puncture in

accordance with Metal-Fabs instructions for the installation of protective devices.

Extensions to Existing Tubing Runs

A concealed tubing run may be modied to permit an extension of another appliance

locationprovidedthereissufcientcapacitytosafelysupplybothappliancesatthesame time.Ifan

accessiblelocationforthemodicationisnotavailable,theexistingtubingruncanbemodiedasshown

in FIG. 4-12,whichwillresultinaconcealedttingbehindthewallboard.

4.4 ProtEction

Theexiblegaspipingmustbeadequatelyprotectedfrompuncture,shear,crushorotherphysicaldamage

threats. The tubing shall be protected at points of support and when passing through structural members such

as studs, joists and plates in accordance with this section. Protection is required whenever the tubing is

concealed and constrained and within 3 (76) of a potential threat. If the tubing requires protection, the

following measures should be taken.

1. Install shielding devices, i.e. striker plates to protect the tubing from penetration by drill bits, nails

screws, etc. (See FIG. 4-13) in those areas where the tubing will be concealed and will not be free to

move and avoid such puncture threats.

a. At support points and points of penetration less than 2 (51) away from any edge of astud, joist, plate, etc. shielding is required at the area of support and within 5 (127) of each side (if

appropriate). Use a half striker or a full striker plate in these locations.

b. At support points and points of penetration 2 (51) to 3 (76) from any edge of a stud, joist

plate, etc. shielding is required throughout area of support. Use a quarter striker plate in these

locations (See FIG. 4-15).

c. Install oppy steel conduit in locations where striker plates are impractical such as

termination outlets and stub outs, short tubing runs and where tubing is routed

horizontally between studs (See FIG. 4-14).

ALSO NOTE MINIMUM DISTANCES OF FLOPPY STEEL CONDUIT IN FIG.4-21 & 4-22

TERMINATION

FITTING

TEE FITTING

STRIKER

PLATE

MODIFIED INSTALLATIONEXISTINGINSTALLATION

FIG. 4-12 Extension of Existing Tubing Run


30/60

26

2. The best protection is to install the tubing in those out of the way areas where testing has shown no

protection is necessary, for example:

a. Where the tubing is supported more than 3 (76) from any outside edge of a stud, joist, plate, etc. or

wall surface (See FIG. 4-16).

b. Where any non-restrained tubing can be displaced from the direction of potential penetration at

least 3 (76).

c. When tubing is supported under the joists in basements or crawl spaces and is not concealed by

wallboard or ceilings.

5 (127)

5 (127)

5 (127)

26 (660)

NAIL

(NON-RESTRAINED

TUBING LENGTH SAFE

FROM PUNCTURE)

ADEQUATE DISTANCE

FOR ESCAPE

FULL STRIKER PLATE

WALL

TUBING

HALF STRIKER PLATE

PROTECTED AREA, LESS

THAN 3 FT. (9.84m)

INTERIOR

WALLBOARD

MOUNTING BLOCK

TYPICAL WALL STUD

(WOOD OR METAL)

TERMINATION FITTING

STRIPWOUND

METAL CONDUIT

STRIKER PLATES

TUBING

FIG. 4-13 Long Unsupported Tubing Runs, over 3 ft.

(9.84m), Within an Interior Wall Partition

FIG. 4-14 Short Unsupported Tubing Run, under 3 ft. (9.84m),

From an Outlet Device Within a Wall Partition or

Horizontal Run Between Studs

3 (76) OR LESS

FLOOR TUBING

SUPPORT

JOISTS

QUARTER STRIKER PLATES

FIG. 4-15 Shielding Required for Tubing Running Through

Joists Within 3 of a Potential Nailing Surface

FLOORTUBING

WOODEN

BLOCK

G R E A T E R

THAN 3 (76)

SUPPORT

JOISTS

FIG. 4-16 No Shielding Required for Tubing Running Through

Joists Greater Than 3 (76) From a Potential Nailing

Surface

GREATER

THAN 3 (76)


31/60

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outdoor inStAllAtionS

General Provisions

The following additional instructions regard the use of DIAMONDBACK in systems in which

portions of the piping are exposed to the outdoors as required to make connections to gas meters

or gas appliances, which are attached to, mounted on, or located in close proximity to the building

structure.

Wherelocalcodeconictswiththismanual,localcodetakesprecedence.

The external protective covering shall remain intact as much as practical for the given installation.

Any portions of exposed stainless steel tubing shall be protected from the outdoor elements. Exposed

tubingandttingconnectionshallbewrappedwithself-bondingsiliconetape.

When installed along the side of a structure (between the ground and 6 ft. (1.83m) in an exposed

condition, the DIAMONDBACK CSST tubing must be protected inside a conduit or installed in a

location which will not subject it to crushing or puncture damage.

DIAMONDBACK shall not be buried directly in the ground or directly embedded in concrete (e.g

patio slabs, foundations and walkways). When burial or embedment is required, DIAMONDBACK

shall be routed inside nonmetallic (e.g. PVC) conduit. The conduit shall be sealed at any exposed end

to prevent water from entering.

When installed in crawl spaces or underneath mobile homes, DIAMONDBACK shall be installed in

accordance with Metal-Fabs standard installation instructions. No special precautions are required

beneath the structure.

When using a termination plate for an outdoor application, all four mounting fasteners shall be

secured and tight.

4.5 MEtEr HooK-uPS

Meters which depend on the service and house piping for support shall not be directly connected

outdoors with DIAMONDBACK. As shown in FIG. 4-17 & 4-18, steel pipe shall be used to connectthe meter outlet to the Outdoor Termination Fitting or Stub-Out on the exterior wall of the structure or

to a transition from pipe to DIAMONDBACKTM located inside the structure.

Meters which are independently supported with a bracket can be directly connected outdoors with

DIAMONDBACK as shown in FIG. 4-19. If practical, direct connections shall include a 3 (76) to 6

(152) loop of tubing to accommodate differential settling and meter movement.

No mechanical protection is required for outdoor meter connections higher than 6 ft. (1.83m) Note

Consult local code authority.


32/60

28

NOTE: DIAMETER OF HOLE SHOULD BE AT LEAST12 (13) GREATER THAN O.D. OF TUBING AND

SHOULD BE SLEEVED IN ACCORDANCE

WITH LOCAL BUILDING CODE (IF APPLICABLE)

NOTE: DIAMETER OF HOLE SHOULD BE AT LEAST 12 (13) GREATER THAN O.D. OF TUBING

AND SHOULD BE SLEEVED IN ACCORDANCE WITH LOCAL BUILDING CODE

(IF APPLICABLE)

SEALANT

3 - 6

(76 - 152)

RADIUS

3 - 6

(76 - 152)

RADIUS

SEALANT

SEALANT

FIG. 4-17 Meter Connection For Pipe Supported Meter

FIG. 4-18 Pipe Supported Meter

FIG. 4-19 Bracket Supported Meter

HOUSE SERVICE

REGULATOR

SLEEVE

(IF REQUIRED)

SEALANT

(TYPICAL)

DIAMONDBACK

TERMINATION FITTING

OR STUB-OUT

SERVICE LINE

METER

NOTE: DIAMETER OF HOLE SHOULD BE AT LEAST 12 (13) GREATER THAN O.D. OF TUBING

AND SHOULD BE SLEEVED IN ACCORDANCE WITH LOCAL BUILDING CODE

(IF APPLICABLE)


33/60

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4.6 APPliAncE connEctionS

inStAllAtion oF tErMinAtion outlEt

A DIAMONDBACKterminationoutletttingorstub-outttingshallbeinstalledandsecuredtothestructureatallCSSToutletsusedformovableappliancesandquick-disconnectdevices.Thettingsaredesignedto

simplify the installation of gas connections for movable appliances and to minimize the need for concealed

ttings.Thettingshallbesecurelyfastenedinplaceduringrough-in.Itmaybeattachedtoabracespanning

betweenstudsforawalllocation,ordirectlytotheoor.Itmayalsobemountedwithaterminationoutlet

bracket, which is nailed or screwed to the stud (See FIG. 4-20).

APPliAncE connEctionS

Movable appliance connections,suchasrangesanddryers,shallbemadeusingapprovedexible

appliance connectors (See FIG. 4-21).

Fixed appliance connections may be directly connected to the DIAMONDBACK tubing. When the

xedapplianceislocatedinasecure,dedicatedspace,suchasabasement,attic,garageorutilitycloset

theexiblepipingmaybedirectlyconnectedtotheapplianceshut-offvalvewithoutinstallationofaange

ttingorexibleapplianceconnector(See FIG. 4-22).

STRIPWOUND

METAL CONDUIT

NAIL OR SCREW

WALL STUD

TERMINATION

OUTLET BRACKET

BODY

CAP

NUT

WALL STUD

TERMINATION

OUTLET BRACKET

STRIPWOUND

METAL CONDUIT

GAS LINE TUBING

NUT

CAP

BODY

STRIPWOUND

METAL CONDUIT

JOIST

FIG. 4-20 Termination Fitting Mounting Method

TOP VIEW

FLUSH WALL MOUNT

FRONT VIEW

FLUSH WALL MOUNT

FLOOR MOUNT


34/60

30

TYPICAL WALL STUD

(WOOD OR METAL)

EXTERIOR

SHEATHING

STRIPWOUND

METAL HOSE

TERMINATION OR

STUB-OUT FITTING

(CROSS BRACE

MOUNTED)

MOUNTING BLOCKCROSS BRACE

6 (152)

PROTECTED

AREA

INTERIOR

WALLBOARD

INTERIOR

WALLBOARD

TYPICAL WALL STUD

(WOOD OR METAL)

EXTERIOR

SHEATHING

STRIPWOUND

METAL HOSE

TERMINATION OR

STUB-OUT FITTING

(CROSS BRACE

MOUNTED)

MOUNTING BLOCK

PROTECTED

AREA, LESS THAN

3 FT (.91m)

STRIKER PLATES

TYPICAL INSTALLATION FOR METER, BBQ GRILL, PAD MOUNTED EQUIPMENT

FIG. 4-23 Standard Termination or Stub-Out Fitting Mounted On Outside Wall

6 (152)

PROTECTED

AREA

MOVABLE

GAS

APPLIANCE

SHUT-OFF

VALVE

STRIPWOUND

METAL HOSE

CSST TUBING

GAS CONNECTOR

FIG. 4-21 Stainless Steel Gas Connector Connection to a

Movable Gas Appliance

4 (102)

MIN.

STRIPWOUND

METAL HOSE

WALL

CSST TUBING

WALL STUD

TUBE

CLAMP

TUBING

FITTING

SHUT-OFF

VALVE

FIXED

GAS

APPLIANCE

8 MIN. (203)

LENGTH

FIG. 4-22 Direct Tubing Connection to a Fixed Gas Appliance

Shut Off Valve


35/60

31

OUTDOOR

WOODEN

DECK

CONNECTION OF CSST GRILL CONTROLS/SHUT

OFF VALVE SHOULD BE IN ACCORDANCE WITH

THE MANUFACTURERS INSTRUCTIONS.

NOTE: DIAMETER OF HOLES SHOULD BE AT

LEAST 12 (13) GREATER THAN O.D. OF TUBING

AND SHOULD BE SLEEVED IN ACCORDANCE

WITH LOCAL BUILDING CODE (IF APPLICABLE).

NOTE: CSST SHOULD BE INSTALLED ONLY ON INSIDESURFACES OF JOISTS AT THE CENTERLINE.

FIG. 4-24 BBQ Quick-Connect Outlet FIG. 4-25 Elevated Deck Direct Connection

OUTSIDE WALL

ENCLOSUREBOX*

M.B. STURGIS

QUICK CONNECT

OUTLET

STRIKER PLATES

FLOOR

JOIST

SUBFLOOR

STRIPWOUND

METAL HOUSE

INSIDE WALL

*SEE MANUFACTURERS INSTRUCTIONS FOR ENCLOSUREBOXMOUNTINGANDQUICKCONNECTINSTALLATION

Barbecue Grills

Movable grills shall be connected using an approved outdoor appliance connector which shall be

attachedtotheDIAMONDBACKsystemateitheraterminationorstub-outttingasshownin FIG

4-23 or a quick-connect device, such as the M.B. Sturgis gas convenience outlet shown in FIG. 4-24

The M.B. Sturgis gas convenience outlet shall be installed in accordance with the manufacturers

instructions.

Permanently mounted grills located on decks shall be connected to the DIAMONDBACK systemas shown in FIG. 4-25 and in accordance with Metal-Fabs instructions. The outdoor portion of the

DIAMONDBACK shall be supported against the side of any of the inside deck joists. If the elevation

of the deck is below the top of the foundation, any exposed DIAMONDBACK shall be protected

using conduit.

Lights

Permanently mounted gas powered lights located on decks shall be connected to

the DIAMONDBACK system the same as permanently mounted grills as shown in

FIG. 4-25, and in accordance with the manufacturers instructions.

Yard mounted gas powered lights shall be connected to the DIAMONDBACK system as shown

in FIG. 4-26. All DIAMONDBACK installed below grade shall be protected by nonmetallic conduitExposed ends shall be sealed against water entry.

Infrared Heaters

Infrared heaters mounted from ceilings and from walls of structures shall be connected

to the DIAMONDBACK system as shown in FIG. 4-27, and in accordance with

Metal-Fabs instructions.


36/60

32

Pad Mounted Equipment

Gas appliances mounted on concrete pads or bricks, such as heat pumps, air conditioners, pool

heaters and NGV refueling systems, shall be connected to the DIAMONDBACK system at a

terminationorstub-outttingusingeitherrigidpipeoranapprovedoutdoorapplianceconnectoras

shown in FIG. 4-24 & 4-28.

Roof Top Equipment

No special mechanical protection of the tubing is required for connections to roof top equipment.

Wheneverpossible,roofpenetrationsshallincludeanoutdoorterminationorstub-outttingandshallbe located within 6 ft. (1.83m) of the equipment to be connected as shown in FIG. 4-29. Long runs

of tubing shall be supported with nonmetallic blocks every 4 ft. (1.22m) along its outdoor length, and

raised above the roof (as shown in FIG. 4-30) a distance determined by local code/practice.

DIAMONDBACK run vertically up the internal or external side of a building to the roof shall be

protected in accordance with the General provisions of this manual. See vertical run section of this

manual.

STANDARD ELBOW

SHUT OFF VALVE

GAS CONTROLS

HEATER

HANGING

RODS

CEILING JOIST

HEATER

GAS

CONTROLS

MOUNTING

BRACKET

WALL STUD

EXTERIOR

ATTIC

SPACE

ROOF

A) CEILING MOUNT

(PROTECTED AREA)

B) WALL MOUNT

(PROTECTED AREA)C) WALL MOUNTED

OUTDOORS

STANDARD TERMINATION OR

STUB-OUT FITTING

BBQ GRILL PEDESTAL

OR GAS LAMP POST

90 ELBOW

MANUAL SHUT OFF VALVE

SEAL AGAINST

WATER ENTRY

PROTECTION REQUIRED UP TO

6 FT (1.83m) ABOVE GROUND

SMALL GAP BETWEEN

CONDUIT AND FITTING

IS PERMITTED

CONNECTION OF CSST TO EQUIPMENT GAS CONTROLS SHOULD BE IN

ACCORDANCE WITH THE MANUFACTURERS INSTRUCTIONS

FIG. 4-26 Ground Level Buried Connection FIG. 4-27 Ceiling Or Wall Hung Infrared Heater Car Ports/Patios/

Decks


37/60

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FIG. 4-30 Long Outdoor Connection To Mounted Equipment

HUNG CEILING

CSSTTUBING

CLIP

CONCRETE SLAB

WATER PROOFING

GAS

APPLIANCESHUT OFF

VALVE

RIGID

UP TO 6 FT.

(1.83M)

FIG. 4-28 Pad Mounted Gas Appliances FIG. 4-29 Short, 1-6 ft. (.30m-1.83m) Outdoor Connection To

Roof Mounted Equipment

CONCRETE PAD

APPLIANCE

CAP

DRIP LEG

STEEL PIPE OR APPROVED OUTDOOR

APPLIANCE CONNECTOR

SHUT OFF VALVE

NOTE: DIAMETER OF HOLE SHOULD BE AT LEAST 12

(13) GREATER THAN O.D. OF TUBING AND SHOULD

BE SLEEVED IN ACCORDANCE WITH LOCAL

BUILDING CODE (IF APPLICABLE).CSST

PAD MOUNTED GAS APPLIANCE:

- HEAT PUMP

- AIR CONDITIONER

- POOL HEATER

- NGV REFUELING FOUNDATION WALL

TERMINATION OR STUB-OUT

WATER

PROOFING

GAS

APPLIANCE*

UNION

SHUT OFF

VALVE

TYPICAL NONMETALLIC TUBING

SUPPORT EVERY 4 FT (1.22m) TUBING

ELEVATED** INCHES ABOVE ROOF

CSSTTUBING

CLIP

SUSPENDED CEILING

CONCRETE SLAB

* WHENTHEEQUIPMENTMANUFACTURERREQUIRESTHEUSEOFAFLEXIBLECONNECTOR.

** HEIGHT OF ELEVATION BASED ON LOCAL PLUMBING/BUILDING REQUIREMENTS AND/OR WINTER ICE BUILDUP.

4 FT (1.22m)

TYP.


38/60

34

CLAMP

JOIST

WALL

STUD

HANGERS

4.7 MAniFold StAtionS

inStAllAtion oF gAS diStriBution MAniFold ASSEMBlY

Manifolds are installed where multiple tubing runs are made from a common location in a parallel

arrangement.Themanifoldmaybemanufacturedfromaonepiece,blackironpipeorbrasscasting;oran

all welded fabrication ofcarbon steel subcomponents or an assembly of approved, black iron pipe nipples

and tees. Depending on the location and available space, different mounting arrangements are permitted.

Amanifoldassemblymaybemountedonthesurfaceofaninteriorwall,betweenopenoor joists,inattic

spaces, or within a partition wall inside a ventilated enclosure as shown in FIG. 4-34.

The manifold assembly shall be installed in an accessible location where it can be inspected, maintained and

serviced if repair or replacement is required. If manifold is located between wall studs behind an access door,

then all penetrations by CSST shall be caulked or made gas resistant with grommets. Ventilation of manifold

enclosure shall be into living area and not into wall space. Examples of manifold arrangements are shown in

FIG. 4-31 through 4-33.

TO APPLIANCE

DIAMONDBACK

FITTING

PLUG (TEST PORT)

UNION

VENT LIMITER

(MUST POINT UP)

MINIMUM 10 PIPE DIAMETERS

BEFORE CHANGING DIRECTIONS

MAXTROL325-3L

REGULATORDRIP LEG

TEE (OPTIONAL)

APPROVED VALVE

DIAMONDBACK

FITTING

FROM GAS METER

FIG. 4-31 Typical Regulator/Manifold Conguration When Using A Vent Limiter

FIG. 4-33 Manifold Mounting MethodFIG. 4-32 Four-Port Manifold


39/60

35

MAniFold And rEgulAtor StAtion

The use of a central manifold and regulator station is recommended for elevated pressure systems which

are typically installed in a parallel arrangement to take advantage of the capacity of the regulator, which is

sufcient forseveralappliances.A four-portmanifold isavailablewith theDIAMONDBACKsystem,or

the use of black iron pipe and tee fabricated manifolds is permitted with this system. The manifold/regulator

station should be located near by the largest gas consuming appliances, typically the furnace or boiler and

the water heater in order to allow short runs to these units. The manifold station may be contained in an

enclosure box called a gas load center. Optional gas shut-off valves may be mounted on the manifold foeach appliance run (See FIG. 4-34).

VENTILATED ENCLOSURE

BOX

REGULATOR

CSST TUBING

UNION

SHUT-OFF VALVE

FIG. 4-34 Gas Load Center


40/60

36

4.8 PrESSurE rEgulAtorS

rEgulAtorS For ElEVAtEd PrESSurE SYStEMS

A tubing system used at gas pressures exceeding 0.5 psi (3.45 kPa) but serving appliances rated for 0.5

psi (3.45 kPa) maximum, shall contain a pounds-to-inches regulator to limit the downstream pressure to no

more than 0.5 psi (3.45 kPa). The regulator must incorporate a lock-up feature limiting downstream pressure

to0.5psi(3.45kPa)undernoowconditions.Theregulatorshallcomplywiththeapplicableprovisionsof

ANSI/Z21.80.

Regulators used to reduce elevated system pressures for use by appliances must also conform to the

following:

1. Must be sized to supply the required appliance load (See Table 4-35 or 3-5).

2. Must be equipped with an acceptable vent limiting device, supplied by the manufacturer, or be

capable of being vented to the outdoors. The vent-limiting device can be used when the regulator is

installed in a ventilated area. DIAMONDBACK ships all regulators with vent-limiters installed.

3. Must be installed in accordance with manufacturers instructions. When a vent-limiter is used, the

regulatormustbemountedinanuprightposition.Installtheregulatorproperlywithgasowingas

indicated by the arrow on the casting.

4. Must be installed in a fully accessible area with an approved shut-off valve ahead of regulator and a

union provided to enable removal of regulator.

5. For outdoor installations, remove the vent-limiter and mount regulator with the vent outlet pointing down

to prevent the entrance of water.

AdJuSting MAxitrol rEgulAtor

The Maxitrol 325-3L, 325-5AL and O.A.R.A. Type 90, Type 95 pressure regulators are AGA/CGA Design

Certiedfor2.0psig(13.79kPa)inletpressure.TheMaxitrol325-3L47and325-5AL48pressureregulators

areAGA/CGADesignCertiedfor5.0psig(34.48kPa)inletpressure.Installations with a supply gas pressure

exceeding 2 psi (13.79 kPa) require a tested and approved over pressure protection device for use with this

regulator. The regulator shall comply with the applicable provisions of ANSI/Z21.80.

The Maxitrol 325 pressure regulators capacity limits depend upon inlet pressure. Refer to FIG. 4-36A &

4-36BforphysicalspecicationsfortheMaxitrol325seriespressureregulators.

1. Regulators can be adjusted to deliver different outlet pressures within a limited range. The range is

determined by the spring installed.

2. Adjustment can be accomplished by rst removing the regulator seal cap to expose the

adjusting screw on the top. Turning the screw clockwise will increase outlet pressure, turning it counter

clockwise will decrease outlet pressure.

3. If spring adjustment will not produce desired outlet pressure, check to make sure supply pressure is at

least equal to desired outlet pressure plus pressure drop of the regulator. If supply pressure is

adequate, consult factory if adjustment still cannot be made. Do not continue to turn regulator

adjusting screw clockwise if outlet pressure readings do not continue to increase. This may

result in over-ring due to loss of pressure control, should there be a subsequent increase in

inlet pressure.

Table 4-35

Capacities and Pressure Drop Through Regulator

Model 7 in. w.c. (13.08 mmHg) 0.5 psi (3.45 kPa) 0.75 psi (5.17 kPa) 1 psi (5.9 kPa)


Maxitrol 325-5AL 338 CFH 476 CFH 583 CFH 673 CFH


O.A.R.A Type 90 155CFH 220 CFH 280 CFH 310 CFH

O.A.R.A. Type 95 359 CFH 504 CFH 627 CFH 719 CFH


41/60

37

Spring Adjustment

The 2 psi (13.79 kPa) system pounds-to-inches house line regulator can be adjusted with an outle

pressure ranging between 7 and 11 in. w.c. (13.08 and 20.55 mmHg) The regulator must be adjusted

according to the manufacturers recommended procedure. A pressure gauge mounted just downstream

of the regulator can monitor the set pressure under various loads.

The regulator is typically set when the system is operating at approximately 75 percent of maximum

load.

The average natural gas appliance is designed to operate at 3 to 4 in. w.c. (5.60 to 7.47 mmHg

appliance manifold pressure, and a pressure difference of 1 to 2 in. w.c. (1.87 to 3.74 mmHg

across the appliance regulator which will prevent slow regulator response. Therefore, the appliance

regulator will operate best at 5 to 6 in. w.c. (9.34 to 11.21 mmHg) inlet pressure. In this case

the 2 psi (13.79 kPa) system regulator should be reset to deliver approximately 8 to 10 in. w.c

(14.94 to 18.68 mmHg) outlet pressure under load to allow for 3 in. w.c. (5.60 mmHg) pressure drop in

the tubing. Regulators supplied by Metal-Fab are set for 7 in. w.c. (13.08 mmHg) output. Some appliances

may have different inlet pressure requirements.

AdJuSting MAxitrol/o.A.r.A. rEgulAtor

rEgulAtor PErForMAncE

Load Response

A performance test should be conducted while operating all appliances at full load. This will test if

adequate pressure is reaching each appliance under full-load conditions. To accomplish this, measure

the line pressure at the appliance connection while operating the appliance.

The inlet pressure for typical natural gas appliances should measure between 4 and 6 in.w.c. (7.47

and 11.21 mmHg) under full-load conditions. If this pressure cannot be obtained a slight adjustment

to the pounds-to-inches regulator may be necessary to increase the line pressure. (If the service

regulator needs to be adjusted, call the gas utility.) Do not set any system regulator over the system

design pressure, 2 or 5 psi (13.79 or 34.48 kPa).

A

BC

PRESSURE ADJUSTMENT SCREW

(UNDER SEAL CAP)

MAXITROLMODEL325-3L

O.A.R.A. TYPE 90

PORTSIZE:1/2X1/2NPT

VENT SIZE: 1/8 NPT

MAXITROLMODEL325-5AL

O.A.R.A. TYPE 95

PORTSIZE:3/4X3/4NPT

VENT SIZE: 3/8 NPT

MODEL 325-7L

PORTSIZE:11/4X11/4NPT

VENT SIZE: 1/2 NPT

(MUST BE VENTED OUTDOORS)

FIG. 4-36A Maxitrol 325 Pressure Regulator

O.A.R.A. Type 90/95 Pressure Regulator


42/60

38

Model NumberSwing

RadiusA B C

325-3L/TYPE 90 3 (76) 3 12 (89) 4 14 (108) 3 78 (98)

325-3LP 3 (76) 3 12 (89) 4 14 (108) 3 78 (98)

325-5AL/TYPE 95 4 78 (124) 5 14 (133) 5 78 (149) 5 716 (138)

325-7L 3 (

flexible gas piping

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